CN1206251A - Adaptive pre-distortion apparatus for linearizing amplifier output within data transmission system - Google Patents
Adaptive pre-distortion apparatus for linearizing amplifier output within data transmission system Download PDFInfo
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Abstract
An adaptive apparatus for compensating the non-linear distorting action of an amplifier in a transmission system. I-channel and Q-channel memories store a plurality of digital pre-distortion correction values. The memories are addressed using a predetermined number of significant bits of an incoming, original information signal to retrieve I-channel and Q-channel pre-distortion correction values. The I-channel and Q-channel pre-distortion correction values are combined, digitally, with I-channel and Q-channel components of the original information signal to pre-distort the original information signal. The pre-distorted signal, in real format, is supplied to the amplifier, and a feed-back sample signal is coupled-off of the output of the amplifier. A comparison is made between the original information signal and the feed-back sample signal in digital format and in the complex domain (I/Q).
Description
The present invention relates to communication system, relate in particular to the system that the nonlinear distortion behavior of the high power amplifier of transmission system is produced negative function.
Broadcast communication system uses a high power amplifier as the signal transmission of system or the part of head-end unit.Unfortunately, high power amplifier has the feature of nonlinear distortion, and it will make the information signal that is exaggerated produce distortion.The nonlinear distortion feature of high power amplifier will seriously influence the instantaneous amplitude and the phase place of signal.Because cost and power dissipation can only be accomplished next " linearisation " high power amplifier of this degree.
Existing technology is often to information signal " precorrection ", with the output of linearized amplifier.One of them of these technology comprises amplitude correction, and it produces a linear segmented precorrection function relevant with the amplifier nonlinearity feature.Consequently obtain one near the desirable segmentation calibration curve of proofreading and correct.This correction is added to information signal.
Also the useful information signal is to a RAM addressing in the known technology, and this RAM comprises the predistortion version that is predetermined of information data value, and is as U.S. Patent No. 4,291, disclosed in 277 the specification.This predistortion version is added to the parts (for example, orthogonal mixer) of feed-in transmission amplifier as signal with the information signal of reality.The sign of the data that the substitution value among the RAM obtains by the expectation in reality and come from and do simulation between demodulated " section " (or re-quantization) sampled signal of amplifier and relatively be updated.Sampled signal is to provide along feedback path by suitable part (for example, a quadrature demodulator), to be used for comparison.
Yet existing systems is subject to the value by orthogonal mixer and quadrature demodulator output.For example, for a system that adopts 16QAM, the quadrature demodulation of sampled signal is subject to one of four level on each real axis (I) or the imaginary axis (Q).Existing system can not provide certain frequency spectrum to proofread and correct.And simulation relatively is subject to the resolution of analog signal.Particularly, the amplitude limiter of demodulator (slicer) is not provided at the information (promptly being exactly to can not get useful information) between the sampling period.Existing system can not be proofreaied and correct out-of-band distortion.Like this, existing system can not proofread and correct by amplifier in 8 vsb systems (8VSB) to the PAM signal of 32 of every words produce non-linear.Particularly, QAM is quantized into a limited level rank group on the every real axis (I) and the imaginary axis (Q).Comparatively speaking, 8VSB goes up at real axis (I) and quantizes, and like this, the imaginary axis (Q) is indefinite variable.
The present invention includes a self-reacting device that is used to compensate the distortion effect that information signal is produced by the transmission amplifier of wideband transmission system, this amplifier makes the desired value skew of the signal characteristic of signal from them, described device comprises: the signal generator that is used to provide a multiple bit digital information signal, be used to store the storing apparatus of the predistortion correction value of a large amount of numerals, be used for selecting the choice device of a predistortion correction value at described storing apparatus, it uses the address of a predetermined number important bit of information signal as memory, predistortion correction value with information signal and selection combines so that the composite set of a pre-distorted signals to be provided with being used for digitlization, be used for pre-distorted signals is added to the generator of amplifier input terminal, be used for from the sampling apparatus of the output coupling sampled signal of amplifier, sampled signal in addition is that the amplification from the predistortion of information signal draws, be used for information signal and sampled signal with number format comparison means relatively, and be used at described storing apparatus based on relatively revise selected predistortion correction value by described comparison means.
Easily, be used for compensating in wideband transmission system and affact the self-reacting device of the distortion of information signal, have the signal characteristic that makes signal amplifier from their desired value skew by transmission amplifier.This device comprises the data supplying device that is used to provide a multiple bit digital information signal.The digital pre-distortion corrected value that the storing apparatus storage is a large amount of.Choice device is selected a predistortion correction value in storing apparatus, the significant bits of a predetermined number of its use information signal is as the storage address.Combiner digitally makes up information signal and selected predistortion correction value so that a pre-distorted signals to be provided.Generator is provided to amplifier input terminal with pre-distorted signals.Sampling apparatus is the output uncoupling of sampled signal from amplifier, and this sampled signal is that the amplification from the predistortion information signal draws.Comparison means compares information signal and sampled signal with number format.Updating device is revised selected predistortion value based on the comparison of being carried out by comparison means in storing apparatus.
Now, the present invention will be with reference to the following drawings, by example, describe, wherein:
Fig. 1 is the schematic diagram of a device;
Fig. 2 is the schematic diagram of an example apparatus;
Fig. 3 is the schematic diagram of the part of the equipment that comprises this device shown in Fig. 2;
Fig. 4 is amplifier transmission curve figure; And
Fig. 5 is the plural loss diagram of expression predistortion correction of the present invention.
Fig. 1 represents the device 10 of compensated information data-signal distortion.According to the present invention, device 10 is for information data provides predistortion correction, and this information data sends with relative two-forty.And the present invention (for example, 18MHz) uses of great use the broadband.
The using system environmental correclation of two-forty and bandwidth and this device 10.Correspondingly, device 10 can be used for having any system of this demand.For example, in device 10 high definition TV (HDTV) systems 12 that are used to as shown in Figure 2.This HDTV system 12 comprises a plurality of signal sources 14, and for example one videotapes the unit, a memory cell, or a receiving element (for example, satellite downlink business).Be provided to overall combined coding device 16 from the signal of signal source 14.Be provided to a distribution transducer 18 from the signal of overall combined coding device 16, this distribution transducer 18 provides a signal for STL multiplexer/transmitter 20.
Between signal source and remote microwave antenna 22 and 24, set up a microwave link, be provided to STL receiver/demodulator 26 from the signal of far-end antenna 24.This signal arrives one eight (8) residual sideband (after this being called " 8VSB ") exciter 32 by a demodulation multiplexer 28 and a transducer 30.8VSB exciter 32 (Fig. 3) comprises according to device 10 of the present invention.The output of 8VSB exciter 32 (Fig. 2) is provided to a UHF/VHF transmitter 34, then can receive a broadcast singal from broadcast antenna 36 at TV 40.The people who understands this technology will have recognized the need to the signal timing line that suitable timing signal is provided of each part of system (all parts that comprise device 10), to be used for the operation of each part synchronously.The people who understands this technology also should understand this fixed cycle operator.Correspondingly, for the sake of clarity, regularly line will be left in the basket.
Forward the detailed description of 8VSB exciter 32 examples as shown in Figure 3 now to, receive inter-area traffic interarea, and arrive a byte randomization equipment 44 through a byte information equipment 42 from transducer 30.Inter-area traffic interarea is through a Reed Solomon encoder 46, and through a Trellis encoder 48.Inter-area traffic interarea is by one or more filters and/or 50, one self-adaptation nonlinear adjusters 52 of adjuster and one or more filter and/or equalizer 54.In preferred embodiment, the inter-area traffic interarea that is input to gamma corrector 52 is made up of 32 bit words that define in a phase-magnitude modulation signal.Gamma corrector 52 is parts of device 10, installs the nonlinear distortion of 10 compensated information signals, and it will be described in greater detail below.
Inter-area traffic interarea is by 56 and upconverter 58 that driven by a local oscillator 60 of a digital to analog converter (DAC).Inter-area traffic interarea advances to transmitter 34 from upconverter 58.In 34 li in transmitter, inter-area traffic interarea (simulate now, but passed through up-conversion) is through a high power transmission amplifier 62 of transmitter 34.Amplifier 62 makes the distorted signals of process amplifier with a nonlinear way.
For example, Fig. 4 is the transfer function figure (promptly being exactly that input is to output) of a high power amplifier.The actual transfer curve of amplifier is shown in solid line among Fig. 4.Linear transfer curve, normally desirable and unreachable, shown in the dotted line among Fig. 4.The figure shows out increase along with input; The deviation of actual transfer curve and ideal situation.
The part of the process of the nonlinear distortion that causes by amplifier 62 by way of compensation, the output of amplifier 62 by " sampling " to provide one to feed back sampled signal.The feedback sampled signal is indicated the output of amplifier, and provides along a feedback paths.Specifically, coupler 64 is coupled out the output of sampled signal from amplifier 62.The feedback sampled signal is by a low-converter 66, and it is the same as same local oscillator 60 drivings with upconverter 58.The feedback sampled signal is passed through an analog to digital converter (ADC) 68, and is provided to gamma corrector 52.
At 52 li of gamma correctors (Fig. 1), in order to compensate the nonlinear distortion that is caused by amplifier 62, information signal (promptly being exactly that after this source data signals is called original information signal) is by predistortion.Specifically, the output of amplifier expectation, through the amplification of the signal of distortion in advance, if be an amplifier 62 when not producing distortion with the signal that occurs.And along with the change of the distorted characteristic of amplifier 62 (for example, because the variation that temperature fluctuation causes, and because the variation that component ageing causes), gamma corrector 52 adapts to the new distortion that predistortions produce from amplifier 62 with compensation.
In gamma corrector 52, original information signal is provided to a reality-multiple transducer 70.It should be understood that (I Q) is added to gamma corrector 52, and this reality-multiple transducer 70 does not need if original information signal is with plural form.For example, the reality of original information signal-multiple conversion will produce the upstream of at least one filter/adjuster 50, and it is with the form running of plural number rather than real number.The purpose of this discussion is explanation rather than restriction, and the data flow that is added to gamma corrector 52 is real, and real-multiple transducer 70 is existing.
The output of real-multiple transducer 70 is I-channel signals, and it is to represent real component and a Q-channel signal, and it is to represent imaginary component.In preferred embodiment, the every word of I channel original information signal comprises 16 bits (promptly being exactly one " partly " of original 32 bit words), and the every word of Q channel original information signal comprises 16 bits (promptly being exactly another of original 32 bit words " partly ").
I channel original information signal is added to I channel summation device 72I as first input, and Q channel original information signal is added to Q channel summation device 72Q as first input.Insert memory 74I at random provides to second input of I channel summation device 72I from the I channel.Similarly, inserting memory 74Q at random to second input of Q channel summation device 72Q from the Q channel provides.At each summation device 72I, the 72Q the inside, two-way provides the signal that comes to be added.
The value that is provided to summation device 72I and 72Q by I channel and Q channel memory 74I and 74Q is the predistortion correction value.Each I channel and Q channel memory comprise an array by stored position, and it is the form by look-up table.The corrected value word in each memory position, this word is consistent with the length of I/Q original information signal word.Therefore, in preferred embodiment, each word in I channel and Q channel memory has 16.
Recommend ground, the size of the array of I channel memory 74I is the same big with the size of Q channel memory 74Q.The I channel is relevant with the bit number of each information data word with the array size of Q channel memory 74I and 74Q, and this information data word is designated " most important ".Particularly, each I channel and Q channel memory 74I, the size of 74Q is 2
K1* 2
K2, K wherein
1Be the number of the indication Most Significant Bit of I channel original information signal, K
2It is the number of the indication Most Significant Bit of Q channel original information signal.In preferred implementation, each channel (I and Q) 8 bits (16 bits altogether) are labeled as most important.Like this, preferably, each memory array (I and Q) has 2
8* 2
8(65636) individual memory position, the size of each memory (I and Q) is 2
8* 2
8* 16.
K the Most Significant Bit that adds Q channel original information signal word by K the Most Significant Bit that uses I channel original information signal word be as an address, comes the corrected value of access I channel memory 74I and be added to second input of I channel summation device 72I.K Most Significant Bit of I channel original information signal word is to connect 78I by a buffering (for example, suitable three condition buffer mutual connection) is provided on address bus 76I.In I channel memory 74I, K Most Significant Bit of I channel original information signal is used as K Most Significant Bit of memory address, and K Most Significant Bit of Q channel original information signal is used as K Least significant bit of memory address.Should be realized that access I channel memory 74I by an address bus buffer control unit and a read/write control line control, this point for the sake of clarity is left in the basket.
Equally, corrected value in the Q channel memory 74Q is to add that by K the Most Significant Bit that uses I channel original information signal word K Most Significant Bit of Q channel original information signal word comes access as an address, and is added to second input of Q channel summation device 72Q.In Q channel memory 74Q, K Most Significant Bit of I channel original information signal is used as K Most Significant Bit of memory address, and K Most Significant Bit of Q channel original information signal is used as K Least significant bit of memory address.Will be appreciated that access Q channel memory 74Q by an address bus buffer control unit and a read/write control line control, this point for the sake of clarity is left in the basket.
To be added to I channel original information signal (by summation device 72I) by the corrected value that memory 74I provides and obtain the I channel information signal of a predistortion.To be added to Q channel original information signal (by summation device 72Q) by the corrected value that memory 74Q provides and obtain the Q channel information signal of a predistortion.The present invention not only provides the correction of signal amplitude distortion, and the instantaneous phase that is caused by amplifier 62 distortion correction is provided.Therefore, the value in the memory has complex number components, and it comes access by using Q channel original information signal as the part of memory address.
The I channel of predistortion and Q channel signal are respectively from summation device 72I and 72Q output.The I channel of predistortion and Q channel signal are provided to multiple-real-turn parallel operation 80.Transducer 80 makes up I channel and Q signals, and exports the information signal of a predistortion with the real number form.The output of multiple-real-turn parallel operation 80 is provided to digital to analog converter 56, with the beginning downstream, from up-converter 58 to transmitter 34 with amplifier 62.Make the nonlinear distortion that causes by amplifier 62 be compensated from the predistortion information signal of multiple-real-turn parallel operation 80 outputs.
Along with the nonlinear distortion characteristics of amplifier 62 change by provide the feedback sampled signal to gamma corrector 52 finish (promptly be exactly, export predistortions from analog to digital converter 68, distortion signal).52 li of adjusters, the feedback sampled signal is input in fact-multiple transducer 82.The output of real-multiple transducer 82 is an I channel feedback sampled signal and a Q channel feedback sampled signal.I channel and original information signal predistortion, amplifier distortion of Q channel feedback sampled signal representative in complex field.In preferred embodiment, I channel and Q channel feedback sampled signal comprise 16 bit words.
Correcting algorithm 84 adaptations or adjustment gamma corrector 52 will be added to the quantity of the predistortion of information data signal subsequently.I channel and Q channel original information signal from real-multiple transducer 70 outputs are provided to correcting algorithm 84 as first input.I channel and Q channel feedback sampled signal are provided to correcting algorithm 84 as second signal.84 li of correcting algorithms, I channel original information signal is compared with a corresponding I channel feedback sampled signal, to detect difference.Preferably, in two I channel signals that are compared deducts from another.Similarly, Q channel original information signal is compared with corresponding Q channel feedback sampled signal, to detect difference.If desired, can carry out ratiometric conversion, with the variation of adaptive system gain in 84 li original information signal of correcting algorithm to I channel and Q channel.
Because gamma corrector 52 is parts in the data streaming system, " original " information data continues by system, and must be processed.And, feed back sampled signal accordingly with a specific original information signal and produced (being exactly to be coupled out) during by amplifier 62 from amplifier out in this original information signal.The feedback sampled signal provides the corresponding original information signal moment after a while to produce for correcting algorithm 84.And, must produce corresponding feedback sampled signal, and arrive correcting algorithm 84 through few component parts.Therefore, correcting algorithm 84 comprises the buffer storage device (not shown), and this storing apparatus is used for the original information signal that short-term keeps each I channel and Q channel, arrives up to the be used for corresponding I channel of comparison and the Q channel feedback sampled signal that are complementary with them.Original information signal (I and Q) remains in the buffer storage, and movable the finishing of corresponding feedback sampled signal (I and Q) (for the sake of clarity relevant and synchronous timing signal that needs is left in the basket again) about providing for correcting algorithm 84 is provided.Comparison between the corresponding signal that present concern correcting algorithm is 84 li.Difference between the feedback (I and Q) of original information signal (I and Q) and the sampled signal returned if any, represents the original information signal should be by the amount of the ratio of predistortion in the distortion of 62 li appearance of amplifier for full remuneration.This can be by being designated " A " vector (Fig. 5) with original information signal in complex plane, will feed back sampled signal and be designated " B " vector and understand in complex plane.Difference " C " vector representation between A and the B vector.The direction that the correction of " C " vector representative sign needs and the error vector of relative amplitude.
Correcting algorithm 84 produces a new I channel correction value and a new Q channel correction value, is used for being adjusted at respectively the value in I channel and Q channel memory 74I and the 74Q.If desired, new I channel and Q channel value are carried out ratiometric conversion.New corrected value is corrected the incoming line 86I that algorithm 84 is provided to I channel and Q channel memory 74I and 74Q respectively, 86Q.Simultaneously, correcting algorithm 84 provides one 8 bit address to be added to address bus 76I and 76Q respectively for each I channel and Q channel memory.The memory address that is provided by correcting algorithm is produced by original I channel in the buffer storage that is stored in correcting algorithm 84 and Q channel signal.
When the distorted characteristic of amplifier 62 changes, correcting algorithm 84 will be finely tuned the corrected value in I channel and Q channel memory 74I and 74Q continuously when identical original information signal moves ahead through data flow.In other words, processing be repetition or experience.The correcting value (promptly being exactly vector C among Fig. 5) that correcting algorithm 84 produces will become more and more littler along with proofreading and correct the desirable predistortion correction value of trend.And when the distorted characteristic of amplifier 62 changed, self-adaptation nonlinear adjuster 52 and its correcting algorithm 84 adapted to new distortion.
Therefore, the invention provides the variation (for example, drift) of more accurate transfer curve control and adaptive system.And, by the pulse distortion or/and system bandwidth limitations and the intersymbol level that produces also be corrected.Particularly, the level between sampling holds by the sampling rate bigger than chip rate.
The self-reacting device that in a transmission system, is used to compensate an amplifier nonlinearity distortion.I channel and a large amount of digitlization predistortion correction value of Q channel memory storage.Memory comes addressing by a predetermined number significant bits of using the original information signal of importing, to produce the predistortion correction value of I channel and Q channel.The predistortion correction value of I channel and Q channel digitally with the I channel of original information signal and the combination of Q channel component so that the original information signal predistortion.Predistortion signal be added to amplifier by real number form, and the feedback sampled signal be coupled out by output from amplifier.Between original information signal and feedback sampled signal, in complex field (I/Q), make comparisons by digital form.
Claims (10)
1. be used to compensate the self-reacting device that affacts the distortion of information signal by a transmission amplifier of a wideband transmission system, this amplifier makes the desired value skew of the signal characteristic of signal from them, described device comprises: the signal generator that is used to provide a multiple bit digital information signal, be used to store the memory device of a large amount of digital pre-distortion corrected values, be used in described memory device, selecting the choice device of a predistortion correction value, it uses a predetermined number significant bits of information signal as memory address, be used for digitally information signal and selected predistortion correction value being made up so that the composite set of a pre-distorted signals to be provided, be used for pre-distorted signals is provided to the generator of amplifier in, be used for sampling apparatus that sampled signal is coupled out from the output of amplifier, sampled signal is that the amplification from the predistortion of information signal gets, be used for the comparison means of information signal being compared with sampled signal, and be used for relatively revising selected predistortion correction value based on what carry out by described comparison means at described storing apparatus with number format.
2. as the device of requirement in the claim 1, wherein said signal generator comprises the device that information signal is provided with I channel and Q channel format.
3. the device as requiring in the claim 2, wherein said storing apparatus comprises and is used to store the I channel of predistortion correction value and the device of Q channel component that the described composite set that comprises has the device that is used to make up the device of I channel component and is used to make up the Q channel component.
4. the device that in claim 1 to 4, requires in any one, wherein said generator comprises a multiple-real-turn parallel operation, a digital to analog converter and a upconverter, and described therein comparison means comprises the device that is used to detect information signal and sampled signal difference.
5. the device described in claim 6, wherein said updating device comprise and are used to revise selected predistortion correction value to comprise the device of information signal and sampled signal difference.
6. as the device of any one requirement in the claim 1 to 5, wherein information signal has 32 words, and described choice device uses the address of 16 significant bits of information signal as memory.
7. the device as requiring in the claim 1, wherein said storing apparatus comprises and is used to store the I channel of predistortion correction value and the device of Q channel component, described choice device comprises the device of the I channel component that is used to select the predistortion correction value, an I channel component of use information signal and a Q channel component are as the storage address during selection, and the device that is used to select the Q channel component of a predistortion correction value, use the I channel component of information signal and Q channel component as a memory address during selection.
8. the device as requiring in the claim 7, wherein the I channel component of information signal has one 16 word, the Q channel component of information signal has one 16 word, and 8 significant bits of I channel component that described choice device uses information signal are as a memory address, and described choice device uses 8 significant bits of Q channel component of information signal as a memory address.
9. the device as requiring in the claim 8, the wherein said device that is used to store the I channel component of predistortion correction value has one to be used to store 2
K1* 2
K2The array of individual predistortion correction value size, wherein k
1Be number as the significant bits of the I channel component of the information signal of memory address, k
2It is number as the significant bits of the Q channel component of the information signal of memory address.
10. the device as requiring in the claim 9, the wherein said device that is used to store the Q channel component of predistortion correction value has one and is used to store 2
K1* 2
K2The array of individual predistortion correction value size, wherein k
1Be number as the significant bits of the I channel component of the information signal of memory address, k
2It is number as the significant bits of the Q channel component of the information signal of memory address.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 98115194 CN1206251A (en) | 1997-06-30 | 1998-06-29 | Adaptive pre-distortion apparatus for linearizing amplifier output within data transmission system |
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| US885374 | 1992-05-19 | ||
| CN 98115194 CN1206251A (en) | 1997-06-30 | 1998-06-29 | Adaptive pre-distortion apparatus for linearizing amplifier output within data transmission system |
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Cited By (10)
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|---|---|---|---|---|
| WO2002011379A1 (en) * | 2000-07-20 | 2002-02-07 | Huawei Technologies Co., Ltd. | Method and apparatus for adaptive digital predistortion in a radio transmitter |
| WO2006066452A1 (en) * | 2004-12-21 | 2006-06-29 | Zte Corporation | A method and system for out of band predistortion linearization |
| US7130357B2 (en) | 2001-12-26 | 2006-10-31 | Lg-Nortel Co., Ltd. | Apparatus and method for compensating error for analog quadrature modulator (AQM) |
| CN1298156C (en) * | 2003-01-08 | 2007-01-31 | Lg电子株式会社 | Image distortion correcting equipment and its method |
| CN101018069B (en) * | 2006-02-06 | 2010-08-18 | 阿尔卡特朗讯 | Multi-band multi-standard transceiver circuit for wireless communication mobile-and base-stations |
| CN101040502B (en) * | 2004-01-21 | 2011-03-09 | 电力波技术公司 | Wideband enhanced digital injection predistortion system and method |
| CN101272155B (en) * | 2007-03-20 | 2011-11-23 | 中兴通讯股份有限公司 | TDD mode digital predistortion power amplifier |
| CN102281221A (en) * | 2011-06-23 | 2011-12-14 | 中兴通讯股份有限公司 | Nonlinear systematic distortion correction device and method |
| CN101569142B (en) * | 2006-12-28 | 2012-11-14 | 英特尔公司 | Predistortion correction loop-back based on high linearity and low linearity modes |
| CN102143106B (en) * | 2010-02-01 | 2013-08-21 | 富士通株式会社 | Adaptive digital predistortion device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002011379A1 (en) * | 2000-07-20 | 2002-02-07 | Huawei Technologies Co., Ltd. | Method and apparatus for adaptive digital predistortion in a radio transmitter |
| US7130357B2 (en) | 2001-12-26 | 2006-10-31 | Lg-Nortel Co., Ltd. | Apparatus and method for compensating error for analog quadrature modulator (AQM) |
| CN1316807C (en) * | 2001-12-26 | 2007-05-16 | Lg-北电株式会社 | Device and method for compensating error of analog integral modulator |
| CN1298156C (en) * | 2003-01-08 | 2007-01-31 | Lg电子株式会社 | Image distortion correcting equipment and its method |
| CN101040502B (en) * | 2004-01-21 | 2011-03-09 | 电力波技术公司 | Wideband enhanced digital injection predistortion system and method |
| US7848717B2 (en) | 2004-12-21 | 2010-12-07 | Zte Corporation | Method and system for out of band predistortion linearization |
| WO2006066452A1 (en) * | 2004-12-21 | 2006-06-29 | Zte Corporation | A method and system for out of band predistortion linearization |
| CN101040501B (en) * | 2004-12-21 | 2011-11-23 | 中兴通讯股份有限公司 | Method and system with outer predistortion linearization |
| CN101018069B (en) * | 2006-02-06 | 2010-08-18 | 阿尔卡特朗讯 | Multi-band multi-standard transceiver circuit for wireless communication mobile-and base-stations |
| CN101569142B (en) * | 2006-12-28 | 2012-11-14 | 英特尔公司 | Predistortion correction loop-back based on high linearity and low linearity modes |
| CN101272155B (en) * | 2007-03-20 | 2011-11-23 | 中兴通讯股份有限公司 | TDD mode digital predistortion power amplifier |
| CN102143106B (en) * | 2010-02-01 | 2013-08-21 | 富士通株式会社 | Adaptive digital predistortion device and method |
| CN102281221A (en) * | 2011-06-23 | 2011-12-14 | 中兴通讯股份有限公司 | Nonlinear systematic distortion correction device and method |
| WO2012174842A1 (en) * | 2011-06-23 | 2012-12-27 | 中兴通讯股份有限公司 | Distortion correction apparatus and method for non-linear system |
| CN102281221B (en) * | 2011-06-23 | 2017-03-15 | 中兴通讯股份有限公司 | Nonlinear systematic distortion correction device and method |
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